華北電力大學科技學院ARM課內實驗四

1、科 技 學 院課程設計報告( 2015 - 2016年度第 二 學期)名 稱：ARM試驗UART 題 目： 院 系： 科 技 學 院 班 級： 13k2 學 號：31 學生姓名： 指導教師： 張老師 設計周數(shù)： 成 績： 日期：2016年 5月 10 日實驗四：（1）UART0-4一：實驗現(xiàn)象1. 本次實驗是使用LPC178/177x系列Cortex-M3中的通用異步收發(fā)器UART0-4，短接P0.2和TXD0、P0.3和RXD0，通過串口0-4發(fā)送緩沖器中的數(shù)據(jù)，通過串口調試軟件可以觀察到發(fā)送的數(shù)據(jù)（16進制格式）。由于UART中的uart.c文件已經對UART0-4的管腳接口都已設置好，所

2、以我們無需在對其進行設置，只需用杜邦線連接各管腳和TXD0、RXD0，就可觀察現(xiàn)象。所以這里只寫出UART0的，其余的和UART0的一樣。2. 現(xiàn)象如下圖所示：UART0UART1：總共有64個數(shù)據(jù)。(由BUFSIZE的值可得出)。二：實驗代碼分析（1）uart.c文件部分此部分為UART的設置部分，因此所有的UART實驗都有，所以后面實驗就不在給出解釋。首先我們要知道UART的基本設置流程。下面幾張圖說明：代碼如下：#include ./LPC177x_8x/LPC177x_8x.h#include ./LPC177x_8x/type.h#include uart.hvolatile uin

3、t32_t UART0Status, UART1Status;volatile uint32_t UART2Status, UART3Status;volatile uint32_t UART4Status;volatile uint8_t UART0TxEmpty = 1, UART1TxEmpty = 1;volatile uint8_t UART2TxEmpty = 1, UART3TxEmpty = 1;volatile uint8_t UART4TxEmpty = 1;volatile uint8_t UART0BufferBUFSIZE, UART1BufferBUFSIZE;vo

4、latile uint8_t UART2BufferBUFSIZE, UART3BufferBUFSIZE;volatile uint8_t UART4BufferBUFSIZE;volatile uint32_t UART0Count = 0, UART1Count = 0;volatile uint32_t UART2Count = 0, UART3Count = 0;volatile uint32_t UART4Count = 0;UART0-4的中斷處理函數(shù)（以UART0為例，1-4只需改變0為對應的數(shù)字即可）void UART0_IRQHandler (void) uint8_t u

5、iIIRValue = 0, uiLSRValue = 0; uint8_t uiDummy = uiDummy; uiIIRValue = LPC_UART0-IIR; uiIIRValue = 1; /中斷標志寄存器值右移1位 uiIIRValue &= 0x07; if ( uiIIRValue = IIR_RLS ) /接收線狀態(tài)中斷 uiLSRValue = LPC_UART0-LSR; / 讀取接收線狀態(tài)寄存器 溢出中斷、奇偶中斷、幀中斷、UART RBR中包含錯誤數(shù)據(jù)和幀間隔中斷處理 if ( uiLSRValue & (LSR_OE|LSR_PE|LSR_FE|LSR_RXFE

6、|LSR_BI) ) UART0Status = uiLSRValue; uiDummy = LPC_UART0-RBR; return; if ( uiLSRValue & LSR_RDR ) /接收FIFO不為空中斷 UART0BufferUART0Count = LPC_UART0-RBR; UART0Count+; if ( UART0Count = BUFSIZE ) UART0Count = 0; else if ( uiIIRValue = IIR_RDA ) /接收數(shù)據(jù)可用中斷 UART0BufferUART0Count = LPC_UART0-RBR; UART0Count+

7、; if ( UART0Count = BUFSIZE ) UART0Count = 0; else if ( uiIIRValue = IIR_CTI ) /字符超時中斷 UART0Status |= 0x100; else if ( uiIIRValue = IIR_THRE ) /發(fā)送保持寄存器空中斷 uiLSRValue = LPC_UART0-LSR; if ( uiLSRValue & LSR_THRE ) UART0TxEmpty = 1; else UART0TxEmpty = 0; UART0-4端口引腳初始化函數(shù)uint32_t UARTInit( uint32_t Por

8、tNum) if ( PortNum = 0 ) LPC_SC-PCONP |= 0x00000008; #if 0 LPC_IOCON-P0_0 &= 0x07; LPC_IOCON-P0_0 |= 4; /P0.0為U0_TXD LPC_IOCON-P0_1 &= 0x07; LPC_IOCON-P0_1 |= 4; /P0.1為U0_RXD #endif #if 1 LPC_IOCON-P0_2 &= 0x07; LPC_IOCON-P0_2 |= 1; / P0.2為U0_TXD LPC_IOCON-P0_3 &= 0x07; LPC_IOCON-P0_3 |= 1; / P0.3為U

9、0_RXD #endif使能接收FIFO不為空中斷、發(fā)送保持寄存器空中斷、接收線狀態(tài)中斷 LPC_UART0-IER = IER_RBR | IER_THRE | IER_RLS;8為數(shù)據(jù)位，無奇偶檢驗位，1位停止位 LPC_UART0-LCR = 0x83; /鎖定除數(shù)訪問 LPC_UART0-FCR = 0x07; /使能并復位FIFO NVIC_EnableIRQ(UART0_IRQn); return (TRUE); else if ( PortNum = 1 ) LPC_SC-PCONP |= 0x00000010; #if 0 LPC_IOCON-P0_15 &= 0x07; LP

10、C_IOCON-P0_15 |= 1; /P0.15為U1_TXD LPC_IOCON-P0_16 &= 0x07; LPC_IOCON-P0_16 |= 1; / P0.16為U1_RXD #endif #if 1 LPC_IOCON-P3_16 &= 0x07; LPC_IOCON-P3_16 |= 3; /P3.16為U1_TXD LPC_IOCON-P3_17 &= 0x07; LPC_IOCON-P3_17 |= 3; /P3.17為U1_RXD #endif #if 0 LPC_IOCON-P2_0 &= 0x07; LPC_IOCON-P2_0 |= 2; /P2.0為U1_TX

11、D LPC_IOCON-P2_1 &= 0x07; LPC_IOCON-P2_1 |= 2; /P2.1為U1_TXD #endif 使能接收FIFO不為空中斷、發(fā)送保持寄存器空中斷、接收線狀態(tài)中斷 LPC_UART1-IER = IER_RBR | IER_THRE | IER_RLS; 8為數(shù)據(jù)位，無奇偶檢驗位，1位停止位 LPC_UART1-LCR = 0x83; LPC_UART1-FCR = 0x07; /使能并復位FIFO NVIC_EnableIRQ(UART1_IRQn); return (TRUE); else if ( PortNum = 2 ) LPC_SC-PCONP

12、|= 0x01000000; #if 1 LPC_IOCON-P0_10 &= 0x07; LPC_IOCON-P0_10 |= 1; /P0.10為U2_TXD LPC_IOCON-P0_11 &= 0x07; LPC_IOCON-P0_11 |= 1; /P0.11為U2_RXD #endif #if 0 LPC_IOCON-P4_22 &= 0x07; LPC_IOCON-P4_22 |= 2; /P4.22為U2_TXD LPC_IOCON-P4_23 &= 0x07; LPC_IOCON-P4_23 |= 2; /P4.23為U2_RXD #endif #if 0 LPC_IOCON

13、-P2_8 &= 0x07; LPC_IOCON-P2_8 |= 2; / P2.8為U2_TXD LPC_IOCON-P2_9 &= 0x07; LPC_IOCON-P2_9 |= 2; /P2.9為U2_RXD #endif 使能接收FIFO不為空中斷、發(fā)送保持寄存器空中斷、接收線狀態(tài)中斷 LPC_UART2-IER = IER_RBR | IER_THRE | IER_RLS; 8為數(shù)據(jù)位，無奇偶檢驗位，1位停止位 LPC_UART2-LCR = 0x83; LPC_UART2-FCR = 0x07; /使能并復位FIFO NVIC_EnableIRQ(UART2_IRQn); retu

14、rn (TRUE); else if ( PortNum = 3 ) LPC_SC-PCONP |= 0x02000000; #if 0 LPC_IOCON-P0_25 &= 0x07; LPC_IOCON-P0_25 |= 3; / P0.25為U3_TXD LPC_IOCON-P0_26 &= 0x07; LPC_IOCON-P0_26 |= 3; /P0.26為U3_RXD #endif #if 0 LPC_IOCON-P0_0 &= 0x07; LPC_IOCON-P0_0 |= 2; /P0.0為U3_TXD LPC_IOCON-P0_1 &= 0x07; LPC_IOCON-P0_

15、1 |= 2; /P0.1為U3_RXD #endif #if 1 LPC_IOCON-P4_28 &= 0x07; LPC_IOCON-P4_28 |= 2; /P4.28為U3_TXD LPC_IOCON-P4_29 &= 0x07; LPC_IOCON-P4_29 |= 2; / P4.29為U3_RXD #endif #if 0 LPC_IOCON-P0_2 &= 0x07; LPC_IOCON-P0_2 |= 2; /P0.2為U3_TXD LPC_IOCON-P0_3 &= 0x07; LPC_IOCON-P0_3 |= 2; / P0.3為U3_RXD #endif 使能接收FI

16、FO不為空中斷、發(fā)送保持寄存器空中斷、接收線狀態(tài)中斷 LPC_UART3-IER = IER_RBR | IER_THRE | IER_RLS; 8為數(shù)據(jù)位，無奇偶檢驗位，1位停止位 LPC_UART3-LCR = 0x83; LPC_UART3-FCR = 0x07; /使能并復位FIFO NVIC_EnableIRQ(UART3_IRQn); return (TRUE); else if ( PortNum = 4 ) LPC_SC-PCONP |= 0x00000100; #if 0 LPC_IOCON-P0_22 &= 0x07; LPC_IOCON-P0_22 |= 3; /P0.2

17、2為U4_TXD LPC_IOCON-P2_9 &= 0x07; LPC_IOCON-P2_9 |= 3; /P2.9為U4_RXD #endif #if 1 LPC_IOCON-P1_29 &= 0x07; LPC_IOCON-P1_29 |= 5; /P1.29為U4_TXD LPC_IOCON-P2_9 &= 0x07; LPC_IOCON-P2_9 |= 3; /P2.9為U4_RXD #endif #if 0 LPC_IOCON-P5_4 &= 0x07; LPC_IOCON-P5_4 |= 4; / P5.4為U4_TXD LPC_IOCON-P5_3 &= 0x07; LPC_I

18、OCON-P5_3 |= 4; /P5.3為U4_RXD #endif 使能接收FIFO不為空中斷、發(fā)送保持寄存器空中斷、接收線狀態(tài)中斷 LPC_UART4-IER = IER_RBR | IER_THRE | IER_RLS; 8為數(shù)據(jù)位，無奇偶檢驗位，1位停止位 LPC_UART4-LCR = 0x83; LPC_UART4-FCR = 0x07; /* 使能并復位FIFO */ NVIC_EnableIRQ(UART4_IRQn); return (TRUE); return( FALSE );UART0-4串口發(fā)送數(shù)據(jù)初始化void UARTSend( uint32_t portNum

19、, uint8_t *BufferPtr, uint32_t Length ) if ( portNum = 0 ) while ( Length != 0 ) while ( !(UART0TxEmpty & 0x01) ); / 等待發(fā)送標志為1 LPC_UART0-THR = *BufferPtr; /發(fā)送標志清0 BufferPtr+; / 指針后移 Length-; /發(fā)送數(shù)目減1 else if ( portNum = 1 ) while ( Length != 0 ) while ( !(UART1TxEmpty & 0x01) ); /等待發(fā)送標志為1 LPC_UART1-TH

20、R = *BufferPtr; /發(fā)送數(shù)據(jù) UART1TxEmpty = 0; /發(fā)送標志清0 BufferPtr+; /指針后移 Length-; /發(fā)送數(shù)目減1 else if ( portNum = 2 ) while ( Length != 0 ) while ( !(UART2TxEmpty & 0x01) ); /等待發(fā)送標志為1 LPC_UART2-THR = *BufferPtr; /發(fā)送數(shù)據(jù) UART2TxEmpty = 0; /發(fā)送標志清0 BufferPtr+; /指針后移 Length-; /發(fā)送數(shù)目減1 else if ( portNum = 3 ) while (

21、Length != 0 ) while ( !(UART3TxEmpty & 0x01) ); / 等待發(fā)送標志為1 LPC_UART3-THR = *BufferPtr; /發(fā)送數(shù)據(jù) UART3TxEmpty = 0; /發(fā)送標志清0 BufferPtr+; /指針后移 Length-; /發(fā)送數(shù)目減1 else if ( portNum = 4 ) while ( Length != 0 ) while ( !(UART4TxEmpty & 0x01) ); /等待發(fā)送標志為1 LPC_UART4-THR = *BufferPtr; /發(fā)送數(shù)據(jù) UART4TxEmpty = 0; /發(fā)送標

22、志清0 BufferPtr+; /指針后移 Length-; /發(fā)送數(shù)目減1 return;(2)主函數(shù)部分#include ./LPC177x_8x/LPC177x_8x.h#include ./LPC177x_8x/type.h#include ./UART/uart.hextern volatile uint32_t UART0Count;extern volatile uint8_t UART0BufferBUFSIZE;extern volatile uint32_t UART1Count;extern volatile uint8_t UART1BufferBUFSIZE;exte

23、rn volatile uint32_t UART2Count;extern volatile uint8_t UART2BufferBUFSIZE;extern volatile uint32_t UART3Count;extern volatile uint8_t UART3BufferBUFSIZE;extern volatile uint32_t UART4Count;extern volatile uint8_t UART4BufferBUFSIZE;void dataInit (uint32_t uiLocation) /UART0-4發(fā)送數(shù)據(jù)初始化子函數(shù) uint32_t i =

24、 0; switch (uiLocation) case 0: for (i = 0; i BUFSIZE; i+) UART0Bufferi = i; UART0Count+; break; case 1: for (i = 0; i BUFSIZE; i+) UART1Bufferi = i; UART1Count+; break; case 2: for (i = 0; i BUFSIZE; i+) UART2Bufferi = i; UART2Count+; break; case 3: for (i = 0; i BUFSIZE; i+) UART3Bufferi = i; UART

25、3Count+; break; case 4: for (i = 0; i IER = IER_THRE | IER_RLS; UARTSend( 0, (uint8_t *)UART0Buffer, UART0Count ); LPC_UART0-IER = IER_THRE | IER_RLS | IER_RBR; break; case 1: LPC_UART1-IER = IER_THRE | IER_RLS; UARTSend( 1, (uint8_t *)UART1Buffer, UART1Count ); LPC_UART1-IER = IER_THRE | IER_RLS |

26、IER_RBR; break; case 2: LPC_UART2-IER = IER_THRE | IER_RLS; UARTSend( 2, (uint8_t *)UART2Buffer, UART2Count ); LPC_UART2-IER = IER_THRE | IER_RLS | IER_RBR; break; case 3: LPC_UART3-IER = IER_THRE | IER_RLS; UARTSend( 3, (uint8_t *)UART3Buffer, UART3Count ); LPC_UART3-IER = IER_THRE | IER_RLS | IER_

27、RBR; break; case 4: LPC_UART4-IER = IER_THRE | IER_RLS; UARTSend( 4, (uint8_t *)UART4Buffer, UART4Count ); LPC_UART4-IER = IER_THRE | IER_RLS | IER_RBR; break; while (1) int main (void) SystemInit(); UARTInit(0, 9600); /初始化串口0 dataInit(0); /初始化串口0的發(fā)送數(shù)據(jù) dataSend(0); /通過串口0發(fā)送數(shù)據(jù) 三：通過修改某些語句從而使得串口信息發(fā)生變化U

28、ART0-4的試驗現(xiàn)象都是只發(fā)送一次數(shù)據(jù)，所以在串口調試助手里只能看到一次數(shù)據(jù)，所以可以修改主函數(shù)中的某些語句就可使得數(shù)據(jù)循環(huán)發(fā)送，但是在實驗驗證修改是否正確時，不知道為什么還是只發(fā)送一次，但理論上是可以循環(huán)發(fā)送的。（2）UART自動波特率一：實驗現(xiàn)象1. 本次實驗是使用LPC178/177x系列Cortex-M3中的通用異步收發(fā)器中的自動波特率的設置，短接TXD0和P0.2、RXD0和P0.3，通過串口調試助手發(fā)送字符a或A，ARM將自動測到波特率，并將波特率發(fā)送到串口調試軟件中，也就是ARM先自動匹配出波特率的值，并將匹配的值在發(fā)送到串口調試助手窗口中顯示，注意：如果誤差較大，可調節(jié)鎖相環(huán)

29、倍頻值和外設分頻值。2. 現(xiàn)象如下圖所示：二：實驗代碼分析#include ./LPC177x_8x/LPC177x_8x.h#include ./LPC177x_8x/type.h#include ./UART/uart.h#include stdio.h#include string.hvoid AutoBaud(void) char cStr64; uint32_t uiBand = 0; uint16_t uiDlm = 0; uint16_t uiDll = uiDll = 0; LPC_UART0-ACR = 0x01; /允許自動波特率 while (LPC_UART0-ACR & 0x01) != 0x0); /等待自動波特率測量完成 測量結束 LPC_UART0-ACR |= 0x01 IER &= (0x01 LCR = 0x83; /DLAB=1 uiDlm = (uint16_t)LPC_UART0-DLM; uiDll = (u